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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b86f00896441893a527aef8e9359a8a6773ccaf8e29269ce71555d59dbc9406' 
  AND token = 'Tk2LK9ebFwpFONJAm1LSsEpsvigHO229QOLWqBCF7+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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