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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7409a0cf97ab3fad0b4caa6f8ec9a3a120f75060cc9e520835e40e35dd1194d' 
  AND token = 'bcUr3oGDjD1dxxjtJlXCmUjRKtoTxVEuTf0hV63peQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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