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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a936a6975abd46cd637564fcc153e96366f3f2857dc5639fa0cf71fde40539a5' 
  AND token = '04Q3dkYwPd4/Dt5N8Y0g1WnI9OU9PWvakJkaloTctXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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