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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa1e937080ae748ebb8a2a34a8c1dcf434d9033d34c7188258798be5f80305d' 
  AND token = '7lOq1F0dE50a1Q4WukDaofk1JG3Dy+SuWnSgBDxCOm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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