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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ed7a658a56a7f0bf56da506793fb037b9e43a665d4eda22d91c72b2a8c97d2' 
  AND token = '6KAcQC6G4txCkNo8XJxjQLRwevMc6M8aOMxDPtTaHsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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