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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e02701267fa12829a289059d5e20ac6693da3decbf7a673f3bdec3765c26ba' 
  AND token = 'H7GW+87SEN5+2vgs8+69y3x9Y8fSLY9Yv2CqwxXsk6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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