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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6996349b5e620682e0fb3e872b0726ff25476409888a4e19d5d2669b97c0b343' 
  AND token = 'b+MzigxPTobHDO+W9o+0In6vuBc0KXPOSomR/58aG28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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