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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28c76df4c37b55b194866f1796fca8915a6c1a58f554043918b68793816bdd28' 
  AND token = 'n3hmFk8KkRstPIwiUwbF8ZBIUaKNB5p/7D3218EQOT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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