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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431d36a3b5b060e8bc8c599aa676e16795e5e876fcb96a660bba79097ac404ef' 
  AND token = 'qkIpor1HxbRQRIrrTqqsA0/qdhKu4WoBkOctC7APi5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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