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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417189d5f409a44a0904bc2a2465e3788705658efe6dfb62d21fd003a42d6313' 
  AND token = '7zTYMSR1pzlRrcCtJTdqj1zf61prYjm4WVsY8Yo0Zlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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