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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f6a9c7a1e17faae27cc25a8d13a03d33fad360553649da53b842452a13aa95' 
  AND token = 'YZgeDTHyehGF/WDS26iCGEqdJBLR8spZpCsplSNP/eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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