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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e559d1e7069390de6d0aeb31d49569dcc87c7f9a22f683bd6b86b8184b76d355' 
  AND token = 'Y0kQ+nzEFQ115nZTx4+KEiowTMnn20yJCzGayYDnHYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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