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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9418620d40cc5f10ea26c50fdf405ad7a463e07a9b8df4808a137331f6b9645' 
  AND token = 'xu61w6C6USO1G/rA4sItt7E5Y77k4JDTx9KCnKVblNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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