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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f93213cb5ef70736b3aabd4704a9dc5dc669cfc5aa3a39c1451edceee61fc4e' 
  AND token = 'nw+EAd9JgwaQPj4ym0dEW3+Va3D9ZxmnLp4QTyryB3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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