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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7915314b3da04c5d457c26c5e775ba056c6bf549b0e99dd0f13c9208d5f52c9' 
  AND token = 'BiAXfZ/+JVHP6560l7wvdB3fucOIpm04WI+t409ZtzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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