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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccaba1351cc24bfc1ef489908bd75e8287966a0ec308736546f7a68064d1f508' 
  AND token = 'HO6C8SiOmhSKiNVLSUYJqe3LfwI46IVi7W3eWvg68V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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