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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '877c4d4b17ba4f832fcc3d2dd5ea2c18d4ab0aa38b62647490706e01d8e92b87' 
  AND token = 'CJMZP/FjUGsJYGC4i0xAe7PdI8s6jUHiG1y417cyEtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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