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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e106ba5c04866ac1ec31bc5e6adfa77205dab22d34486a76db5ae785741f4f3b' 
  AND token = 'fstqgZpKaLvnae8c9UgiASenO3Gslm1Snr0HkVEJnMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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