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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36da44146adab6edefb944ecf79f141037228c38c3384f3267a544138c319cc5' 
  AND token = 'AgKY37baoygHpymCUpws/aww0qM5Utw73BmGNqCD350=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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