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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b003d5cfb04fcf97bbc66a1134689df4f1ca5abd681132fec95f6b5f38f0240a' 
  AND token = '9Wb7C/+enRjaYgeW3QJNTSOKg4JOFNy5BVW07c4Xgg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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