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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41eada7de86b060b4edba38124024bd3063e086e7cf59c2cdef76db4c287561e' 
  AND token = '24sUB0Jj0eENS4cDQF5DSWyO3PqVUuyZwWyyh20zJQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}