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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29c65a4491832e2e325f24a9de18df2c0cabb4aa8f143080e29858c9b9fa2e7' 
  AND token = 'BghPh93x70f2V85LjRvEmIefqUAcXNWiEG9KKSYXZvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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