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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7844d0325c4c4454747929d50a5753f052963d1af8492cdfffd8617dc36fcda4' 
  AND token = 'ou/ySKmB/yT8np5vOVuFxzHID+lJK1y3kP4KfwxIKx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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