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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a93a63a596d302e75965fbc4255a3ee78f72844109bd73efb0a47d44b20ec6' 
  AND token = 'Yp1ktf5i7r4G6mL6UL2979eBWsCm0ARRDax0GhOALu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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