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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c1caf29a7bb3a6c8ff6914bcc9c71233c88981a1f79fe6503a64998a668f5e' 
  AND token = 'gdlXKYl/5vqAhrRwC6neR5XvyKSrcehRhp92D0Kbuc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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