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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2585d11d6e056a310040b0fa0b81f522934fbbd1067dc6ee290f5b13a05806d5' 
  AND token = '0cGdBHCENpeDFOVQGYPgHD05UNJV4eWyXkPNeK/XXic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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