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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9ccfd0f3d8895610e07482ba27a8889e3c1b3a82bf5666d4a71a0e13a0b2c9' 
  AND token = '1m1hRWQhAUKCWLX88yF22dXLQnyGUBra7vDISuZLm9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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