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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e540b8812a52e82edfa7cd4b983f74a918c261bfa2e3a17ddbeebbfead0210a9' 
  AND token = '13PlNAD/4UR60PQw2SxQkZ7sOEjYMQF8lcEC0cJzR3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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