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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee553fd7bd4083afe0ecb6895a50ebf8ee5de67b77e7442fa8e31ef97356312a' 
  AND token = 'IjGEh8aiCnG+DYhhHrEEhIn79APWvGMLrWg8yxzDALg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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