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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0978a66632e3d41eb43d9ddfda68424453a14c39ae0b596a8c9bf18c992d3cb' 
  AND token = '4NvGzrBFEyluJ3rhsF6AQ5iDI3dYbePCzQv2sh586oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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