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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a20d40e4523192f6c30f5a1a62ee3576953fb75ac4abbbfdc64dd70786ad0b2' 
  AND token = 'A+AdQ9aeD/CZTC6vXemac6rrwoMwlEsQiUrHSf/iGYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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