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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45afb330d9e854edab5c58bf41b74e7dba673485c20899b012c149a5bbd4d4d1' 
  AND token = '9OZ6pEvylIOFO3uBI7kgMcpuoo0mCNPjeYgQplZkQsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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