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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeb3b27e85f5af35df4a16531ece47206c695fe1b1bc07eabad46b6b98d34089' 
  AND token = 'Ti4vQnVMMacSpMAtOF5nQCslulQoNiS3zIiywBJ+1no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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