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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3fd22ab04cbd27c45af41b411aebaaa4e110cc3eb35d20ed9c4b4d1ce39e74' 
  AND token = 'RmIirGrOMqI9al5aK8xMRRYM88gGRuW8XkWkItEWy/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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