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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e88de905543f67f60ba62f2d0e099d4cdd8241d293a98063ec5801b0737b460' 
  AND token = 'g1kc4xaOKl5KIGW2SQHuxwhD018Sbn7VUHz3+Dfe75Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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