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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e325202d74d8cd63c8a7c6918e58d527a73e33afe39ebe26c534bd28d95d3d3a' 
  AND token = '3L3MgUnSqtqFEBbvL38wzhn2Z11pVkuzViNa+4HpJbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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