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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db8601eb4303b6480c45246d13650f75a5e44951b37b97a07fb78c47e236b4b' 
  AND token = 'fJuoc4MLc7KESwlhAKF2omvA3r1EKcPc+tmuR/dfbgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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