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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7978f3d9371b9294b2e76d2d2553b08238cea33f9a51908c94a655cf8e3529ea' 
  AND token = 'A3geEDVzs6fPCF0ZZojq+Lo7n9M3zWve+N4CnQ5A/34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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