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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafb2e6fef60585d0e6cb6e3648cda1fe590312e259dbe97ea67a6af18093d7e' 
  AND token = 'rkKfyUL0qckfgfGopQajo5OvpQRlAOceLoQpYW/0xCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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